Yes it is a nice fish, perciform. I am working with such fishes from Poland. It is Percoidei indet. Some morphological characters are not well preserved, so species determination is impossible. It resembles "Serranus budensis", the species which needs revision. By Prokofiev it is classified as Oligoserranus budensis, by Bannikov Oliganodon budensis.

It is probably a "close" relative of Lutjanidae or Symphysanodontidae.

Such fishes are in the Outer Carpathians in southern Poland, not in Holy Cross Mountains. Their age is usually Oligocene.

Wg mnie to raczej wygląda na jakiegoś skorupiaka

I share the opinion of my predesessor

It was sold  for  me  as  the  fish - found  in  Świetokrzyskie  Mountains in the  central Poland.

It is a fish!! a teleostan one, not a mollusc, nor a crustacean!! Bones of the head do not let any doubt, I think

It is a perciform fish (Teleostei). For detaied identification, need to examine the specimen.

As wrote Mee-mann, detailed identification is not possible on the basis of a this sole image. I might be, indeed, a "perciform" fish, as our understanding and definition of the group as changed (https://sites.google.com/site/guilleorti/home/classification-v-2)

few legends have been added in the attached file, to provide clues to provide arguments it is not a mollusc, nor a crustacean!

Yes it is a nice fish, perciform. I am working with such fishes from Poland. It is Percoidei indet. Some morphological characters are not well preserved, so species determination is impossible. It resembles "Serranus budensis", the species which needs revision. By Prokofiev it is classified as Oligoserranus budensis, by Bannikov Oliganodon budensis.

It is probably a "close" relative of Lutjanidae or Symphysanodontidae.

Such fishes are in the Outer Carpathians in southern Poland, not in Holy Cross Mountains. Their age is usually Oligocene.

THANKS! THANKS! THANKS. If somebody  like  to have  a full resolution photo for  his  purposes - i will send it .

Andrzej

Do you have meristic counts of the dorsal spines/rays, branchiostegal rays, vertebrae (e.g. 10+14)?  Are the posterior margins of the preopercle and/or posttemporal serrated?  Cycloid or ctenoid scales?  Lutjanids have a maxillary sheath comprised entirely of the first infraorbital, in sparoids the first two infraorbitals.  You could also try sending your photo to Alexandre Bannikov whom has extensive experience with fossil percoids from Bolca and beyond.

Good luck.

thanks  a lot Louise.I enclose  still  better  version  of the  stone . In the  upper  part  you  can  recognize  even the  scales  of the  fish:

Sure looks like a serranid perciform to me.  Very reminiscent of some specimens from Frauenweiler (Germany) in the Stuttgart collection.

Some Serranidae

Thanks!!